NEC Commercial Electrical Practice Test

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Prepare for the NEC Commercial Electrical Test with multiple choice questions each with detailed explanations. Study efficiently to excel in your exam!

Practice this question and more.

What is the minimum trade size of EMT that shall not be used?

1/2 inch
3/4 inch
1/4 inch
1 inch

The correct answer is: 1/4 inch

The minimum trade size of EMT (Electrical Metallic Tubing) that should not be used is correctly identified as 1/4 inch. According to the National Electrical Code (NEC), the smallest standard sizes of EMT available start at 1/2 inch. The use of 1/4 inch EMT is not recognized, as it does not meet the requirements for standard conductors, fittings, or physical protection typically provided by metal conduit systems. It is crucial to understand the specifications and standards set by the NEC to ensure safety and effectiveness in electrical installations. Using tubing sizes that are not within the accepted standard can lead to issues such as inadequate protection for conductors, difficulties in installation, and potential violations of code, which could result in increased risks during operation. Thus, sticking to recognized and accepted sizes, starting from 1/2 inch, is essential for compliance and safety in electrical work.